package com.hmdp.utils;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    /**
     * 开始的时间戳，可以自己定义
     */
    private static final long  BEGIN_TIME = 1640995200L;
    /**
     * 序列号的位数
     */
    private static final int COUNT_BITS = 32;

    @Autowired
    private StringRedisTemplate stringRedisTemplate;


    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timeSecond = nowSecond - BEGIN_TIME;
        //2.生成序列号
        //获取当前日期，精确到天
        String data = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //自增长
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + data);

        //拼接并返回
        return timeSecond << COUNT_BITS | count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2022,1,1,0,0,0);
        long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);
    }
}
